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    <title>trisolve</title>
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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>trisolve</b> -  symbolic linear system solver</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[x [,sexp]] = trisolve(A,b [,sexp])  </tt>
      </dd>
    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>A,b</b>
        </tt>: matrices of strings</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    symbolically solves <tt>
        <b>A*x =b</b>
      </tt> , <tt>
        <b>A</b>
      </tt> being assumed to be
    upper triangular.</p>
    <p>
      <tt>
        <b>sexp</b>
      </tt> is a vector of common subexpressions in <tt>
        <b>A, b, x</b>
      </tt>.</p>
    <h3>
      <font color="blue">Examples</font>
    </h3>
    <pre>

A=['x','y';'0','z'];b=['0';'1'];
w=trisolve(A,b)
x=5;y=2;z=4;
evstr(w)
inv(evstr(A))*evstr(b)
 
  </pre>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="trianfml.htm">
        <tt>
          <b>trianfml</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="solve.htm">
        <tt>
          <b>solve</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
    <h3>
      <font color="blue">Author</font>
    </h3>
    <p>F.D, S.S</p>
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